Glass-cutter.



G. A. BADER.

GLASS CUTTER.

APPLICATION FILED IuIYsI, I9I34 1,176,707. Patenwd Mur. 21, IIIIII.

2 SHEETSSHEET 2.

E-g- 2l By Mmm GUSTAV A. BADER, 0F ROCHESTER, NEW YORK.

GLASS-CUTTER.

Specication of Letters Patent.

Patented Mar. 21, 1916` Application filed July 31, 1913. Serial No.782,279.

To all whom it may concern.'

Be it known` that I, GUSTAV A.. BADER, of Rochester, in the county ofMonroe, in the State of New York, have invented new and usefulImprovements in Glass-Cutters, of which the following, taken inconnection with the accompanying drawings, is a full, clear, and exactdescription.

This invention relates to certain improvements in lens cutting machines,and refers more particularly to means for maintaining the cutting edgeor point of the cutter normal to the surface being cut, or rather, inthe most effective cutting position, irrespective of the contour of suchsurface or any variations in the position of the handle or tool-holder.It is well known that the cutting efficiency of these-cutters andparticularly diamond cutters, is most effective when heldin a certainposition, in most instances normal to the surface being cut, and that inmachines for cutting lenses of differ ent surface contours other than'plane surfaces, such, for example, as torio lenses and the like havingconcave or convex surfaces, the .cutter is usually disposed at an angleother than normal to such surface, thereby reducing, if not' entirelydestroying, the cutting efciency of the cutter, or else necessitatingrepeated cutting operations before the -lens is sufliciently cut to thedesired form for breaking away the surplus glass.

The main object, therefore, of my present invention is to provide amachine similar to that set forth in the patent to C. W. Howland, No.701,046, May 27, 1902 with simple means for holding the cutting edge orpoint in proper cutting position or normal to the surface of the glassoperated upon. In other words, I have sought to' provide a machine ofthecharacter with a rocking cutter-support having an outstanding bearing orcontact member spaced some distance apart from the cuttin edge orpointso as to ride upon the sur ace of the glass and thereby maintain suchcutting edge or point substantiall normal to said surface, or in itsmost e ective cutting position during the cutting operation,irrespective of the contour of the surface operated upon.

,Other objects and uses relating to specific parts of the cutting devicewill be brought out in the following description.

In the drawings-Figure 1 is a side elevation, partly in section, of alens cutting machine equipped with my improved cutter.

Fig. 2 is a vertical sectional View through the front portion of thesame machine, taken on line 2 2, Fig. l, showing the cutting device inoperative position upon a torio lens. Fig. 3 is an enlarged verticalsectional view of the detached cutters shown in Figs. l and 2. Fig. 4 isa transverse Vertical sectional view of the lower portion of the cuttershown in Fig. 3.

When the cutting device is used in connection with a lens-cuttingmachine, it may be mounted in or upon the lower end of` a vertical rockshaft or spindle -1- on a horizontally swinging bracket -2- directlyover a rotary lap 3- upon 'which the lens blank afto be cut is placed,said lap being rotated by gears -4- and 5- through the medium of anupright shaft -6- and is also adapted to be moved vertically to bringthe lens into cutting enga-gement with the cutter bymeans of a handlever -7-. as shown more clearly in Figs. 1 and 2.

The form of the lens is determined by a superposed rotary former -7-which is coaxial with the lap 3- and driven by one of the gears -5- atthe same rate of speed as the lap and is provided in its under side withan endless groove corresponding in outline to the form of a lens to becut, the spindle -lebeing provided with a pair of rollers riding in thegroove of the former to maintain said cutter at the desired distancefrom and in the same relation to the axis of the lap and former.

As illustrated more clearly in Figs. 2, 3 and 4, the lens cutting devicecomprises a head -8- tightly fitted to the spindle -1, preferably with ataper "fit, so as to rock therewith and, upon this head is mounted arocking member -9- having two vpoints of contact forengaging the surfaceof the lens during the cutting operation, one of said contacting pointsconsisting of a diamond cutter l0- while the other member preferably.consists of a roller 1l-- spaced some distance apart from the cuttingpoint l0- and prefel? ably held in place upon the rocking member -9- bya pivotal screw -124-. The diamond point -10- is preferably mounted inthe lower end of a suitable supporting spindle or stud -13-4- whichisftted tightlyv in a socket in the central portion o the rocking member-9- and is adjusted so as to bring the point of the cutter in the prOduced axis of the head -Sw and spindle -1-. The rocking member -9- ismounted upon the head -8- in such manner as to rock vertically about thecutting point of the diamond -10- and for this purpose it is providedwith a circular rib -14- slidable in the corresponding circular groove*l5-1 both of which are concentric with said diamond point, the rockingmember being held in operative position by a retainer plate -16- and oneor more screws -l7. The contact member -11- is located in the verticalplane of rocking movement of the member -9- but some distance from thediamond point -10-, as previously explained, and its contact face ispreferably disposed in the same radial plane as the diamond point so asto Contact with the surface of a lens and thereby maintain the diamondsupporting spindle at substantially right angles to such surface tobringthe cutting point of the diamond into the most effective cuttingposition. v

It is evident from the foregoing description that the diamond point andcontact member are both movable with the' rocking member -9 and that thecontact member -1lmoves vertically in an arc about the center of thecutting point. This rocking member is yieldingly connected to the head 8by means of a coil spring -18- tensioned so as to rock the end of themember -9- carrying the contact member -11-v V`toward the glass tomaintain contact between the rollers -11- and lens during the cuttingoperation and at the same time keeping the cutting point of the diamondnormal to the surface of the lens. It may be necessary at times, as forexample inbringing the lens in contact with the cutter, to temporarilywithdraw the contact roller from its operative position and for thispurpose I have provided the rocking member with a handle -19- projectingradially therefrom opposite said contact member *l1- whereby the rockingmember may be operated against the action of its spring -18-. Inadjusting this cutter for use, the contact oints of the cutter androller are arranged) in a radial line with reference to the center ofthe lens or axis of the lap -3- wholly at one side of said axis so thatthe roller will bear on the lens at the inner side or nearest the centerof said lens and axis, the axis of the roller being also disposedradially With reference to the axis of the lap and center of the lens sothat as the point and contact member -3- is relatively short as comparedwith the radius of the lens or lap upon which it is mounted so as tocause the diamond point to maintain its propercutting position throughany variations in contour of the Vsurface along` the cutting line. Theinner or upper edge of the rocking member -9 is also concentric with thecutting point of the diamond While the head -8- is provided with aconcentric recess -20- in which the coil spring is movable and adaptedto ride upon the periphery of the member 9-, thereby concealing thegreater portion of the spring and permitting the free operation of therocking member without excessive friction.

What I claim is:

l. In a lens-cutting machine, the combination of a Work-holder and,atool-holder at one side of the center of the work-holder, one of theparts being movable about such center, the tool-holder having a cuttingmember and a bearing member both dis-L posed in approximately the sameradial line with reference to said center.

2. In a lens-cutting machine, the combination of a revolublelens-support, a toolholder at one side of the axis of the lenssupportand provided with a cutting member and a bearing member disposed inspaced relation, in approximately the same radial line with reference tosaid axis.

3. In a lens-cutting device, the combination of a rotary lens-supportand a rock shaft carrying a tool-holder having acutting point in theproduced axis of the rock shaft, and a bearing member at 4one side ofthe cutting point to rest upon the lens.,

4. In a device of the character described,

a tool-holder turnable about an axis and.

comprising a head, a rocking member mounted on the head, a cutter on therockingmember having its cutting point in said axis in all positionsofadjustment of such member, and a bearing member on said rocking memberat one side of the cutter.

In witnesswhereof I have hereunto set my hand this 29th day of July,1913.

l GUSTAV A. BADER. Witnesses:

H. E. CHASE, I H. P. DENIsoN.

